Code line numbers?

[mcrbids]

Is there a way to reference what line number an error is occuring on?

EG:

<?
// line 1
// line 2
echo GetLineNumber();
// line 4

?>

when run outputs "3" or "Line 3" or something. Does such a widget exist?

I know that the PHP parser is keeping track of this stuff, even after the code is properly compiled - some errors indicate this information at runtime. Here's an example:

<?
$conn=pg_connect('db=foobar, user=postgres, password=notelling');
$cmd="go and ask the mice";
pg_exec($conn, $cmd);
?>

and you'll get an error that also indicates what line (line 3, in this case) the pg_exec statement was executed on. (it'll also tell me what file!)

Is there a function that allows me to access this information?

[Radon3k]

---

<? 1
// line 2
// line 3
echo GetLineNumber();
// line 5

?> line 6

Use something like EditPlus (http://www.editplus.com) that numbers the lines for you.

[mcrbids]

I'm not trying to number the lines...

Let's say you have a big, huge pile of code.

Let's say that input validation failed somewhere,
and you want to track it down.

Wouldn't it be nice to know exactly where the
error occured?

<?

Function Error($linemsg, $error)
{
$fp=fopen('error.log', 'a');
fwrite($fp, "$linemsg - $error\n");
fclose($fp);
return true;
}

<!-- SNIP 10,000 LINES OF CODE -->

if ($a!='somethingexpected')
error(GetLineNumber(), 'A is unexpected!');

<!-- SNIP 3,300 MORE LINES OF CODE -->

?>

and if $a is unexpected, get a log entry like:
File: /usr/bin/bigandnasty.php Line: 10,002 - A is unexpected!

Although I'd never have that many lines of code
in a single file, this would at least allow me to know where
to look!

Any ideas?

[Radon3k]

That's what I'm saying. A program such as EditPlus numbers each line for you automatically. If you get an error on line 10,002 and you open up that file in EditPlus, just scroll down to line 10,002 and there you go.

[mcrbids]

That's fine if you are dealing with a parse error.
But, what if the error is not a parse error?

What if $a=2, but you'd like it to be 3 or higher?

No parse error == no line numbers reported. How would
"edit +" (or just using ^wt in pico) help you there?

[creocast]

I can see what you are trying to do, however unlike a parse error, where a syntax is incorrect, the type of error you are referring to is unique to the individual project/website.

For errors such as: if $a=2, but you'd like it to be 3 or higher? (like you suggested) individual custom error message have to be created by you through the use of if statements. So in this situation it would look like:

if ($a >= 3) {
execute some code
} else {
echo "Error with variable a";
}

However i think what you are trying to get at is a snippet of code which would grab the line and echo it out. So it would appear as:

if ($a >= 3) {
execute some code
} else {
grab line code here
echo "Error with variable a (line $grabbedline)";
}

I would also be interested in that concept. I will look into it. Watch this space.

[mcrbids]

Actually, I have figured this out!

You need to reference a "constant" called LINE...

for example:

<?
echo LINE;
echo LINE;
echo LINE;
?>

Would put out "234", also note its sister
FILE .

-Ben